I've considered getting an extra rear wheel/tire to leave on the trainer but then I end up wondering why... how much wear does the trainer wheel really put on the tire?

It's smooth with no humps, bumps, potholes or street spooge. Logically I think the road tears up a tire a whole lot more, so why change out?

Other than personal preference, is there really a physical wear reason to go through the change?

Lay some science on me girls

spazz